/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraParameterPanelTypes.h
NOTE: Const is a lie, but necessary evil to allow binding during CreateWidget type methods where this is passed as a const ref.
[FOnRequestRename](API\Plugins\NiagaraEditor\FNiagaraParameterPanelItem\FOnRequestRename) & GetOnRequestRename() const